通过在泵浦光和注入光路中加入高精细度模清洁器及提高实验系统锁定的精度，我们对连续变量量子增强的实验系统加以了改进，初始的EPR纠缠光场的正交振幅及正交位相分量的关联度分别从(2.4±0.2) dB，(2.4±0.2) dB提高至(4.0±0.2) dB，(3.9±0.2) dB，而输出纠缠态光场的关联度分别由原来的(3.0±0.2) dB，(3.0±0.2) dB提高至(5.6±0.2 dB)，(5.5±0.2) dB。与此前的实验系统相比，纠缠增强的效率及结果均有一定提高。

By using high finesse mode cleaner in the pump and injected filed and improving the accuracy in locking system, we improved the experimental system of continuous variable entanglement enhancement. The initial correlation degrees between amplitude and phase quadratures of EPR entanglement field are improved from (2.4±0.2) dB, (2.4±0.2) dB to (4.0±0.2) dB, (3.9±0.2) dB, and the quantum entanglement between amplitude and phase quadratures of the output field are improved from (3.0±0.2) dB, (3.0±0.2) dB to (5.6±0.2) dB, (5.5±0.2) dB, respectively. With respect to the past system, both the efficient and result of the entanglement enhancement are improved.